Culvert.



' o; E. GLAssPooLB.

GULVERT.

APPLICATION FILED JAN. 1s, 1908.

Patented Oct. 20, 1908A UNITED STATES PATENT OFFICE.

CHARLES E. GLASSPOOLE, OF ST. PAUL, MINNESOTA.

' cunvaa'r.

Specification of Letters Patent..

Patented Oct. 20, 1808.

Application filed January 13, 1908. Serial No. 410,560.

`that class of culverts made out of thin sheet metal which is reinforced in strength by its particular construction and which is adapted to completely drain water therefrom. Here- 'tofore ithas been customary to use a circumferentially corrugated pipe for this purpose, the corrugations passing j around its surface, themterstlces between said corrugations retaining a certain amount of the water which tends to attack and'rust the metal by standing when the culvert is used. My invention completelr overcomes this'objection in a simple and ellective manner `and at the same' time increases the strength, minimizes the cost of construction,

and reduces wear and friction against water drained by the culvert.- vBy reducing the friction, the capacity of the culvert is very much increased. In culverts employing cir-` cumferential corrugations a whirling effect 1s, imparted to the water passing through it,

while with my invention the water is lfree to pass without whirling. j

. In the` accompanying drawings, Vforming partof this specnication, Figure 1 is a perspective view of asection of culvert showing my .imv rovement; Fig. 2 is an enlarged de- *tail si e view of a portion of one section of the culvert, and Fig. 3 is a detail sectional view taken on the line X-X of Fig. 2, showing more particularly the manner in which the parts of a section of the culvert are secured together.

In the drawings A represents a section of culvert em lo'ying my invention which is in the form ofp a pipe, the ends 2 and 3 of which are' provided with smooth sleeves which are adapted to tightly it corresponding 'sleeves f on the adjacent ends of sections formlng a complete line of the culvert. The section of culvert as shown is providedwith upper and:y lower longitudinal parts which are 'olnedtogether by an intermeshing joint at each side.v T e Vface and is not provided with corruatfions,

completely together.

may be employed for securing the edges of upper part is corrugated at 4,/the' corrugations` running transversely and in cross section appearlngin the form of a reverse curve, `or of any other suitable sha e desired, for the pur ose of reinforcing t e strength of the thin s eet metal out of which the culvert is referably made. The lower part of the cu vert has a smooth inner surso that when the culvert is in use, a the water init passes out without being held in the interstices between corrugations, as when the latter encircle the culvert.

The method and joints D as shown, for attaching the corrugated and smooth parts of the culvert together consists in cutting longitudinally across the ends of the corru ations at each side of the upper art of thecu vert a suicient depth to permit the edges Aof the smooth part of the, culvert being inserted be-A tween outer and inner flaps 5 and 6 which are formed by pressin the ends of the corruga tions iiat overl ...t e longitudinal straight ed es-of the lower art-.mv

he weight of a cad onthau per or cor'- rugated part of the culvert hol s said part down firmly u on the lower or smooth part, this, under or inary circumstances, forming sufficient means for securing the parts firmly When desired, however, rivets 7 these parts together. When the adjacent ends of the sections of the culvert are attached the sleeve connections between the ends also form an interlocking joint which serves to assist in holding the upper and lower arts of the culvert together.

e I have disclosed the upper or corra-- gated part and the lower or smooth part of the culvert .respectively of hollow, semicylindrical shape in cross section, yet it is obvious that when desired the upper part may be made to'extend a greater or less distance up or down at the sides-of the culvert. It is further obvious that whileI have disclosed a conduit made of inetal, that it maybe made "successfully out of othermaterial, they prin-A ciple involved being an upper corru atedV part and a lower smooth part joine together for the purpose of draining all'of the water out of the culvert without holding any in ythe interstices between the corrugations. i -v In accordance with the atent statutes, I have described the princip e of operation of m invention, together with the ap aratus w 'ch I now consider to represent t, e best embodiment thereof, but I desire to haveit understood that the apparatus shown isv only 'illustrative and that the invention can be carried out by other means and-,apiY lied to uses other than those above set fort Within the sco e f the following claims.

Having described my invention, what I- claim as new and desire to protect by Letters Patent, is:-

1. A device of the class set forth, -comprising, a pipe having longitudinal upper and lowerparts, said upper part having transverse corrugatlons and said lower part hav-l ing, 'a pipe made out of thin metal and avu ing upper and lower sections, said upper section avinga serles of transverse corruga- 'tions and said lower section a smooth inner surface, said sections being joined together by overlapping edges along their sides, for

" the purposes specified.

4. A device ofthe class set forth, comprising, a culvert in the form of a pipe made out of thin metal and having upper and lowerv sections B and C, said upper section having series of transverse corrugations 4 and said lower section an inner smooth surface, said sections being joined to ether by fla s 5 and 6 which 'overlap the si e edges of t e lower section, on its outer and inner surfaces, for the purposes specified.

In testimony whereof, I have signed my name to this specification, in the presenceI of two subscribing witnesses.

CHARLES E. GrLASSPOOLE.v Witnesses:

R. A. FISCHER, l L. H. BRADBURY. 

